Lots of good advice on here from everyone.
This is a really good thread to read if your looking to learn about P spot orgasms
Its really long but very worth reading as there is Tons of good tips, recommendations and advice on the thread .
Dont be afraid to add more lube part way through a session if you feel you need it. Highly recommend investing in a quality anal lube. If your using silicone toys, make sure its water based or a hybrid lube as oil and silicon lubes (though great for anal) dont combine well with silicone.
Highly recommend sliquid sassy or sliquid silk, both of which are excellent and i use regularly.
Its also worth having a go with different positions till you find some that work well for you. A few suggestions to get you started, though im sure you’ll find others.
-Laying On your back knees up.
-on your frount laying flat.
-on your side knees tucked up.
-on your knees on the bed, folded forward so your leaning on a surface.
-On all fours on the bed
-Folded over the edge of a bed or the arm of a chair (or other furniture of your choice)
-standing with your legs wide, leaning forward and bracing yourself against something with one hand.
Hopefully some of this is useful.
Anything anal though, you can never have enough lube. Going to the loo before playing is recommended (you can also douch, but personally i dont). If your worried about mess, laying on a towel is a good option.
Go slow, listen to your body and dont forget to breathe and relax whenever insertting or removing anything or if you feel yourself tensing up.
There are also a ton of good threads on the forum for anal so have a search (search bar is up the top right) and you should find a ton of info.